Mill-bush



1, G. SHAFER.

Min Bush.

Patented July 3, 1860.

UNITED STATES PATENT OFFIOE.

JOHN G. SHAFER, OF FULTON COUNTY, PENNSYLVANIA.

MILL-BUSH.

Specification of Letters Patent No. 29,013, dated July 3, 1860.

To all whom it may concern:

Be it known that I, JOHN Gr. SHAFER, of the county of Fulton and State of Pennsylvania, have invented a new and useful Improvement in Mill-Bushes; and I do hereby declare the followinoto be a correct description of the same, reference being had to the accompanying drawing, in which- Figure l is a vertical central section of the bush, the spindle being shown in perspective; Fig. 2 is a top view, the cap and bolts being removed; and Fig. 3 is a separate view of the follower.

The nature of my invention consists in so arranging the parts of a mill bush, that it shall operate to tighten itself by the force of gravitation, the followers being held to the place to which they fall, by means of pawls and ratchets, all as hereinafter more particularly set forth.

In the drawings, where the same part is indicated by the same letter wherever it occurs, B marks the bush block; C, the cap; C, the head of the spindle; D, the bolt heads; F, the followers; H, the bolt holes; N, the nut-s; P, the packing; R the ratchets; p the pawls; S, the spindle.

The bush block B, is made of wood, and receives the spindle S, through its center, as shown in Fig. l. It has four half-wedge shaped cavities in which the followers F, of corres onding form, are received and work. T e sloping sides of these cavities are provided with ratchets R, and the outer sides of the followers are provided each with a set of pawls, of different lengths, which play into the teeth of the ratchets R, the pawls and ratchets being so constructed as to prevent the followers from receding, and hold them securely 'down to any position to which they may descend by the action of gravitation. The followers F are of the shape of a half-wedge, as shown in Fig. 3, their inner faces being grooved to correspond with the external form of the spindle S, as shown in Fig. 2. Below the bush block, and between it and the head of the spindle, is a washer YV, and above the block is a cap C. Through these, as well as through the block, pass holes H, which receive bolts that hold the whole bush together. The bolt heads are seen at D, and the nuts on their other extremities, at N. The space P is for the reception of the packing to retain the oil.

The operation of my improved bush is apparent from the construction. When any wear of the spindle occurs, the followers compensate for it by falling, by gravitation, in the box of the bush, and closely embracing the spindle, with which they are held in contact by the action of the pawls and ratchets.-

lVhat I claim and desire to secure by Letters Patent, is-

The combination of the follower F, the pawls p, and ratchet R, to form a mill bush which will tighten itself by the operation of gravity, substantially in the manner described.

The above specification signed and witnessed this first day of May A. D. 1860.

J. G. SHAFER.

lVit-nesses:

I. B. BISHOP, A. BROOKE TANEY. 

